216243443 has 6 divisors (see below), whose sum is σ = 234157284. Its totient is φ = 199609176.

The previous prime is 216243439. The next prime is 216243449. The reversal of 216243443 is 344342612.

It is not a de Polignac number, because 216243443 - 2² = 216243439 is a prime.

It is a super-2 number, since 2×216243443² = 93522453280988498, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (216243449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 639605 + ... + 639942.

It is an arithmetic number, because the mean of its divisors is an integer number (39026214).

Almost surely, 2^216243443 is an apocalyptic number.

216243443 is a deficient number, since it is larger than the sum of its proper divisors (17913841).

216243443 is a wasteful number, since it uses less digits than its factorization.

216243443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279573 (or 1279560 counting only the distinct ones).

The product of its digits is 13824, while the sum is 29.

The square root of 216243443 is about 14705.2182234743. The cubic root of 216243443 is about 600.2253255552.

The spelling of 216243443 in words is "two hundred sixteen million, two hundred forty-three thousand, four hundred forty-three".